When can I turn on my solar system? IT Support February 12, 2021 23:04 Updated It usually takes about two weeks with SDG&E and inspection approval. Related articles How will I be updated on the install progress? What happens during final inspection? How do I monitor my solar system? Can I Install a Battery to Already Existing Solar Panels? Can you install a solar system on an old roof? Comments 0 comments Please sign in to leave a comment.